In general, \(\phi ^{(r)}\)  can be expressed as a linear combination of thermodynamic
forces of the same order with appropriate tensor coefficients [1]}:
\(\phi ^{(r)}=\sum _{l}A^{(r)}_{l} X^{(r)l}+\sum _{m} B_{m}^{(r)\mu }Y^{(r)m}_{\mu }+\sum _{n} C_{n}^{(r)\mu \nu }Z^{(r)n}_{\mu \nu }~.\) 
